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65. Stratigraphy of the Bituminous Coal Field of Penns-slrania, Ohio, and West Virciuia, by 

 Israel C. White. 1891. 8^. 212 pp. 11 pi. Price 20 cents. 



66. On a Group of Volcanic Rocks from the Tewan Mountains, New Mexico, and on the Occur- 

 rence of Primary Quartz in Certain Basalts, hy Joseph Paxson Iddings. 1890. 8°. 34 pp. Price 5 

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67. The Relations of the Traps of the Newark System in the New Jersey Region, hy Nelson 

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68. Earthquakes in California in 1889, by James Edward Keeler. 1890. 8^. 25 pp. Price 5 

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69. A Classed and Annotated Biography of Fossil Insects, hy Samuel Howard Scudder. 1890. 

 8'-. 101 pp, Price 15 cents. 



70. A Report on Astronomical Work of 1889 and 1890, hy Robert Simpson Woodward. 1890. 8"=. 

 79 pp. Price 10 cents. 



71. Index to the Known Fossil Insects of the AVorld, including Myriapods and Arachnids, hy 

 Samuel Hubbard Scudder. 1891. 8°. 744 pp. Price 50 cents. 



72. Altitudes between Lake Superior and the Rocky Mountains, hy Warren Upham. 1891. 8°. 

 229 pp. Price 20 cents. 



73. The Viscosity of Solids, by Carl Barus. 1891. 8^. xii, 139 pp. 6 pi. Price 15 cents. 



74. The Minerals of North Caroliua, by Frederick Augustus Geuth. 1891. 8^. 119 pp. Price 

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I 75. Record of North American Geology for 1887 to 1889, inclusive, by Nelson Horatio Darton. 



1891. 8°. 173 pp. Price 15 cents. 



j 76. ADictionary of Altitudes in the United States (Second Edition), compiled by Henry Gannett, 



' Chief Topographer. 1891. 8'=. 393 pp. Price 25 cents. 

 I 77. The Texan Permian and its Mesozoic Types of Fossils, hy Charles A. White. 1891. 8°. 51 



pp. 4 pi. Price 10 cents. 



78. A Report of Work done in the Division of Chemistry and Physics, mainly during the Fiscal 

 Year 1889-'90. F. W. Clarke, Chief Chemist. 1891. 8". 131 pp. Price 15 cents. 



79. A Late Volcanic Eruption in Northern California and its Peculiar Lava, by J. S. Diller. 



80. Correlation Papers— Devonian and Carboniferous, by Henry Shaler Williams. 1891. 8°. 

 279 pp. Price 20 cents. 



81. Correlation Papers — Cambrian, by Charles Doolittle Walcott. 1891. 8°. 547 jip. 3 pi. 

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82. Correlation Papers — Cretaceous, by Charles A. White. 1891. 8°. 273 pp. 3 pi. Price 20 

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83. Correlation Papers— Eocene, hy William Bullock Clark. 1891. 8°. 173 pp. 2 pi. Price 

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84. Correlation Papers— Neocene, hy W. H. Dall and G. D. Harris. 1892. 8^. 349 pp. 3 pi. 

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85. Correlation Papers — The Newark System, hy Israel Cook Russell. 1892. 8'=. 344 pp. 13 pi. 

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86. Correlation Papers — Archean and Algonkian, hy C. R. A^an Hise. 1892. 8^. 549 pp. 12 pi. 

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87. A Synopsis of American Fossil. Brachiopoda, including Bibliography and Synonymy, by 

 Charles Schuchert. 1897. 8'-\ 464 pp. Price 30 cents. 



88. The Cretaceous Foraminifera of New Jersey, by Rufus Mather Bagg, Jr. 1898. 8°. 89 pp. 

 6 pi. Price 10 cents. 



89. Some Lava Flows of the Western Slope of the Sierra Nevada, California, by F. Leslie 

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90. A Report of Work done in the Division of Chemistrv and Physics, mainly during the Fiscal 

 Year 1890-'91. F. W. Clarke, Chief Chemist. 1892. 8". 77 pp. Price 10 cents. 



91. Record of North American Geology for 1890, hy Nelson Horatio Darton. 1891. 8°. 88 pp. 

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92. The Compressibility of Liquids, by Carl Barus. 1892. 8^. 96 pp. 29 pi. Price 10 cents. 



93. Some Insects of Special Interest from Florissant, Colorado, and Other Points in the Tertiaries 

 of Colorado and Utah, by Samuel Hubbard Scudder. 1892. 8^. 35 pp. 3 pi. Price 5 cents. 



94. The Mechanisru of Solid Viscosity, by Carl Barus. 1892. 8*^. 138 pp. Price 15 cents. 



95. Earthquakes in California in 1890 and 1891, by Edward Singleton Holdeu. 1892. 8'^. 31pp. 

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96. The Volume Thermodynamics of Liquids, by Carl Barus. 1892. 8^. 100 pp. Price 10 cents. 



97. The Mesozoic Echinodermata of the United States, by AV. B.Clark. 1893. 8°. 207 pp. 50 pi. 

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98. Flora of the Outlying Carboniferous Basins of Southwestern Missouri hy David White. 

 1893. 8-^'. 139 pp. 5 pi. Price 15 cents. 



99. Record of North American Geology for 1891, by Nelson Horatio Darton. 1892. 8^. 73 pp. 

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100. Bibliography and Index of the Publications of the LT. S. Geological Survey, 1879-1892 hy 

 Philip Creveliug Warnian. 1893. 8^. 495 pp. Price 25 cents. 



101. Insect Fauna of the Rhode Island Coal Field, by Samuel Hubbard Scudder. 1893. 8^. 

 27 pp. 2 pi. Price 5 cents. 



102. A Catalogue and Bibliography of North American Mesozoic Invertebrata, by Cornelius 

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